CLN: prelims for MultiIndex.get_value

pandas/core/indexes/multi.py

@@ -1,5 +1,15 @@
 from sys import getsizeof
-from typing import Any, Hashable, Iterable, List, Optional, Sequence, Tuple, Union
+from typing import (
+    TYPE_CHECKING,
+    Any,
+    Hashable,
+    Iterable,
+    List,
+    Optional,
+    Sequence,
+    Tuple,
+    Union,
+)
 import warnings
 
 import numpy as np
@@ -27,7 +37,7 @@
     pandas_dtype,
 )
 from pandas.core.dtypes.dtypes import ExtensionDtype
-from pandas.core.dtypes.generic import ABCDataFrame
+from pandas.core.dtypes.generic import ABCDataFrame, ABCSeries
 from pandas.core.dtypes.missing import array_equivalent, isna
 
 import pandas.core.algorithms as algos
@@ -56,6 +66,9 @@
     pprint_thing,
 )
 
+if TYPE_CHECKING:
+    from pandas import Series  # noqa:F401
+
 _index_doc_kwargs = dict(ibase._index_doc_kwargs)
 _index_doc_kwargs.update(
     dict(klass="MultiIndex", target_klass="MultiIndex or list of tuples")
@@ -2318,8 +2331,10 @@ def reindex(self, target, method=None, level=None, limit=None, tolerance=None):
     # --------------------------------------------------------------------
     # Indexing Methods
 
-    def get_value(self, series, key):
+    def get_value(self, series: "Series", key):
         # Label-based
+        assert isinstance(series, ABCSeries)
+
         if not is_hashable(key) or is_iterator(key):
             # We allow tuples if they are hashable, whereas other Index
             #  subclasses require scalar.
@@ -2338,7 +2353,7 @@ def _try_mi(k):
             new_index = maybe_droplevels(new_index, k)
             return series._constructor(
                 new_values, index=new_index, name=series.name
-            ).__finalize__(self)
+            ).__finalize__(series)
 
         try:
             return _try_mi(key)